WELL, I SOLVED THE FAN NOISE ON MY KPA500. HAVING HAD SOLID STATE AMPS IN THE PAST I LIKE TO RUN THE FAN AT THE LOW NUMBER ONE SPEED. I'VE BEEN BUGGED ABOUT SOME FAN NOISE WHICH I'M SURE WOULDN'T BOTHER OTHERS BUT DID ME. I WENT TO RADIO SHACK AND GOT A PACK OF GROMMETS. I USED THE SMALL 5/16 GROMMETS IN THE FAN HOLES WHICH FIT NICELY AND USED ANOTHER ONE BETWEEN THE FAN AND THE AMPLIFIER CASE. I TOOK OUT THE SPACERS AND THAT DID IT. IT IS AS SILENT AS IT CAN BE AND NO MORE MILD METALLIC WHINE. I'M HAPPY. IF YOU ARE BOTHERED BY THE NOISE GIVE THIS A TRY. 73, STEVE w0sz
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